Drilling-machine



W. T. SEARS.

DRILLING MACHINE.

APPLICAHON FILED APR. 22, 1918.

1,358,025. Patented Nov. 9, 1920.

7i 5 avwenfoz Q 2 JJLR/W J5 nah UNITED, STATES,

PATENT OFFICE.

WILLARD r. SEARS, or n'noonvnn, NEW YORK, AS$IGNOR To times-easement COMPANY, or new Yon'K, a. Y., A CORPORATION on NEW JERSEY.

DRILLING-MACHINE.

Specification of Letters Patent.

Patented Nov. 9, 1920.

Application filed April 22, 1918. Serial No. 229,997.

To all whom it may concern:

Be it known that I, WILLARD T. SEARS, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Drilling-Ma chines, of which the following is a specification.

The principal object of the invention is to provide in combination with a feed mechanism for drillingmachines improved means whereby the rate of feed can be varied at will, preferably by varying the speed of a separate electric feed motor, and whereby the connections between the motor and the other parts of the feed mechanism may be easily shifted to provide a high speed ratio or a low speed ratio as desired.

In the accompanying drawings I have shown the invention as applied to a simple vertical drilling machine, but it will be understood that it can be applied to drilling machines of other types when desired. .It will also be understood that various modifications and substitutions of equivalents may be made in the feed mechanism and in the operating and controlling mechamsm therefor without departing from the spirit of the invention as defined by the claims appended to this specification.

Of the drawing:

Figure 1 is a side elevation of a drilling machine embodying the invention.

Fig. 2 is a fragmentary sectional view, on an enlarged scale, taken along the center of the horizontal feed shaft.

, Fig. 3 is a fragmentary view taken along the line 3-3 of Fig. 2.

Fig. lis a fragmentary sectional view taken along the line 4- l0f Fig. 2.

Fig. 5 is a diagram of the electrical connections.

Referring to the drawing, 1 represents the main frame of the machine, 2 the worl; sup porting table carried by the main frame and 3 the vertical drill spindle, rotatably mount ed in bearings carried by the main frame. Power for rotating the spindle 3 is supplied through a suitable means such as the belt pulley l and is transmitted to the spindle through suitable connections wh ch include a gear positioned within a casing 5 and splined on the spindle. These power transmitting connections are not shown in detall is mounted on a longitudinal; horizontal shaft 9 rotatable in suitable hearings on the main frame. Secured to the shaft. .9 is a worm wheel 10 which meshes with a worm 11 secured to a transverseshaft 12 rotatably mounted in bearings 13 and 14 on the main frame.

Power is supplied for feeding from a shaft, the speed of which can be varied independently of the speed ofthemain'drive of the machine. Preferably I make use of a separate electric feed motor 15 connected with a horizontal transverse feed shaft 16. Change-speed. power transmitting devices are interposed between the motor and the feedmechanism. As illustrated, dilferently diametered belt pulleys 17 and 18' are mounted on the shaft 16. Loosely mounted on the shaft 12 are two differently diametered belt pulleys l9 and 20 which are in register respectively with the beltpulleys 17 and 18. The pulleys 17 and 19 are connected by a belt 21 and thepulleys l8 and 20ers connected by a belt 22. Formed respectively on the belt pulleys 19 and 20 are toothed clutch elements 23 and 24. Slidably mountedon the shaft 12 between the clutch elements 23 and 24: is a toothed clutch element 25 adapt ed to engage either of the first said clutch elements. When the clutch element 25 is in engagement with the clutch element 23 the motor serves to drive the shaft 12 at a rela tively slow speed. Then the clutch element 25 is in engagement with the clutch element 24 themotor serves to drive the shaft 12 at a relatively high speed. It will be seen that the shaft 12,through the worm and wheel gearing, serves to rotate the shaft 9 and thus to move the spindle 3 vertically.

For moving the clutch element 25, I provide a shaft 26 extending through the shaft 28 in the shaft 12. The shaft 26 is provided at its front end with an operating element such as a hand wheel 29 whereby it may be moved. It will be seen that by moving the able drill splndle, a work supporting table shaft 26 longitudinally the clutch element 25 may be engaged witheither of the clutch elements 23 or 24, as desired. 7

As described, the connection between the clutch element 25 and the shaft 26 is such that the shaft may be turned without affecting the adjustment of the clutch. I preferably utilize the-rotative movement of the shaft for Controlling the speed of the feed drive shaft 16. When there is a separate feed motor the shaft 26 operates an electric controller such as 30. :This controller comprises a pivotedarm 31 which is splined on theshaft 26 sons to permit the shaft to move longitudinally. as illustrated in the diagram of the electrical connections, the controller 30 has a plurality of contact points 32 which when engaged by the arm 31 will serve to cause the motor to rotate in one direction at any one of several speeds. The controller also has a plurality of contacts 33 which when engaged by the arm 31 will cause the motor to rotate in the opposite direction at any one of a plurality of speeds. Vl hen the arm 31 is in its central neutral position the connections for the motor are broken and the motor will be idle. The arm 31, as before stated, is splined on the shaft 26 and it will therefore be clear that the operator, by turning the hand wheel 29, may adjust the controller so that the motor will rotate in either direction at any desired speed. Preferably there is splined on the shaft 26 near its front end a collar carrying an indicator 3 1. Mounted adjacent the inclicator 34 is a dial 35 with markings thereon to indicate the positions of the arm 31 of the controller.

Obviously it would be detrimental for the clutch element 25' to be thrown into or out of engagement with either of the clutch elements 23 or 2 1 while the motor is rotating at full speed. I therefore provide interlocking means which prevent the shaft 26 from being moved longitudinally except when it is so adjusted as to hold the arm 31 in its neutral position. For this purpose I provide a collar 36 surrounding the shaft 26 near its rear end and suitably fixed against movement. This collar 36 is provided with an H-slot 37 into which projectsa pin 38 on the shaft 26. When the arm 31 of the controller is in any position except the neutral position, the pin 38 is in one or the other of the circumferential sections of the slot 37, thus preventing the longitudinal movement of the shaft 26 to shift the clutch ele ment 25. However, when the arm 31 is in its neutral position, the pin 38 is in alinement with the longitudinal section of the H- slot, thus permitting the shaft 26 to be freely moved longitudinally to move the clutch element 25 from one position to the other.

I What I claim is:

1. In a drilling machine having a rotatand mechanism for effecting a relative feeding movement longitudinally of the spindle, the combination with the feed mechanism, of a rotatable feed shaft driven independently of the spindle, manually controllable means for varyingfthe speed of rotation of the feed shaft in one direction, and manually controllable change-speed power transmitting mechanism. between the feed shaft and the feed mechanism.

2. In a drilling machine having a rotatable drill spindle, a work-supporting table and mechanism for effecting-a relative feeding movementlongitudinally of the spindle, the combination with the feed mechanism, of power operated means driven independently of the spindle and including mechanical change-speed mechanism for effecting the feeding movement in either direction, and a single element for controlling the direction of feeding movement and the feeding speed thereof. j I 3. In a drilling machine having a rotatable drill spindle, a work supporting table and mechanism for effecting a relative feeding movement longitudinally of the spindle, the combination with the feed mechanism, of arotatable feed shaft, manually controllablemeans for starting, stopping or reversing the feed shaft or for varying the speed of rotation thereof in one direction independently of the speed of ro tation of the spindle, and manually confeed mechanism. 1

In a drilling machine having a rotatable drill spindle, a work supporting table and mechanism foreifecting a relative feedmg movement longitudinally of the spin- 'dle, the combination with the feed mechanism, of an electric motor operable independently of the spindle, manually controllable means for varying the speed of the motor, and manually controllable change-speed power transmitting mechanism between the motor and the feed mechanism. i

5. In a drilling machine having a rotatable drill spindle, a work supporting table and mechanism for effecting a relative feeding movement longitudinally of the spindle, the combinationwith the feed mechanism, of an electric motor operable independently of the spindle, manually controllable means for starting, stopping or reversing the momechanism" between the feed shaft and the tor or for varying the speed thereof, and manually controllable change-speed power transmitting mechanism between the motor and the feed mechanism.

6. In a drilling machine having a rotatable drill spindle, a work supporting table and mechanism for effecting a relative feeding movement longitudinally of the spindle, the combination with the feed mechanism, of a rotatable feed shaft, means for varying the speed of rotation of the shaft independently of the speed of rotation of the spindle, change-speed power transmitting mechanism between the feed shaft and the feed mechanism, and a manually operable element adapted by one movement to vary the speed of the feed shaft and by another movement to adjust the change-speed mechanism.

7. In a drilling machine having a rotatable drill spindle, a work supporting table and mechanism for effecting a relative feeding movement longitudinally of the spindle, the combination with the feed mechanism, of an electric feed motor, change-speed power transmitting mechanism between the motor and the feed mechanism, and a manually operable element adapted by one movement to vary the motor speed and by another movement to adjust the changespeed mechanism.

8. In a drilling machine having a rotatable drill spindle, a work supporting table and mechanism for effecting a relative feeding movement longitudinally of the spindle, the combination with the feed mechanism, of a rotatable feed shaft, means for varying the speed of rotation of the shaft independently of the speed rotation of the spindle, change-speed power transmitting mechanism between the feed shaft and the feed mechanism, and a manually operable element adapted by an oscillatory movement to vary the speed of the feed shaft and adapted by a rectilinear movement to adjust the change-speed mechanism.

9. In a drilling machine having a rotatable drill spindle, a work supporting table and mechanismincluding worm and wheel gearing for effecting a relative feeding movement longitudinally of the spindle, the combination with the feed mechanism, of a rotatable hollow shaft carrying the worm, a rotatable feed shaft, means for varying the speed of rotation of the feed shaft independently of the speed of rotation of the spindle, change-speec power transmitting mechanism between the feed shaft and the hollow shaft, and a manually movable shaft located within the hollow shaft and adapted by an oscillatory movement to vary the speed of the feed shaft and adapted by an and mechanism including worm and wheel gearing for effecting a relative feeding movement longitudinally of the spindle, the combination with the feed mechanism, of a rotatable hollow shaft carrying the worm, an electric motor operable independently of the spindle, change-speed power transmitting mechanism between the motor and the hollow shaft, a manually movable shaft located within the hollow shaft, an electric controller for the motor operable by an oscillatory movement of the last said shaft to vary the speed of the motor, and means operable by a rectilinear movement of the last said shaft to adjust the change-speed mechanism.

11. In a drilling machine having a rotatable drill spindle, a work supporting table and mechanism for effecting a relative feeding movement longitudinally of the spindle, the combination with the feed mechanism, of a rotatable feed shaft, manually controllable means for starting, stopping or reversing the speed shaft .or for varying the speed of rotation thereof in one direction independently of the speed of rotation of the spindle, manually controllable changespeed power transmitting mechanism between the feed shaft and the feed mechanism, and means for preventing the adjustment of the change-speed mechanism except when the speed controlling means for the feed shaft is in stopping position.

12. In a drilling machine having a rotatable drill spindle, a work supporting table and mechanism including worm and wheel gearing for effecting a relative feeding movement longitudinally of the spindle, the combination with the feed mechanism, of a rotatable hollow shaft carrying the worm, a rotatable feed shaft, means for starting and stopping or varying the speed of rotation of the feed shaft independently of the speed of rotation of the spindle, change-speed power transmitting mechanism between the feed shaft and the hollow shaft, a manually movable shaft located within the hollow shaft and adapted by an oscillatory movement to vary the speed of the feed shaft and adapted by an endwise movement to adjust the changespeed mechanism, and means for preventing the endwise movement of the last said shaft except when it is in the angular position for stopping the feed shaft.

In testimony whereof I hereunto afix my signature.

WILLARD T. SEARS. 

